Retrieving tool fitting in and engaging wash pipe



J. H. WEBER Nov. 27, 1956 RETRIEVIHG TOOL FITTING IN AND ENGAGING WASHPIPE 3 sham-sheet. 1

Filed Dec. 9, 19 54 J. H. WEBER Nov. 27, 1956 3 Sheets-Sheet 2 FiledDec. 9, 1954 l n I 0/! 8 5 i W I 5 5 415 11/11 4/ 5 m V/I/ H w 7 f//////5 l 7 I IN V EN TOR.

J. H. -WEBER Nov. 27, 1956 RETBIEVING TOOL FITTING IN AND "ENGAGING WASHPIPE Filed Dec. 9, 1954 8 Sheets-sheaf. 3

wall/VI IN VEN TOR.

United States Patent RETRIEVENG TOOL FITTING IN AND ENGAGING WASH PIPEJohn Hugh Weber, Abilene, Tex.

Application December 9, 1954, Serial No. 474,197 a 7 Claims. (Cl.166-218) My invention relates to a retrieving tool fitting into andcooperating with the wash pipe which 1s used in recovery operations inthe drilling of deep wells such as 011 wells, and especially to suchwells as are drilled with a rotary bit. For such operations the washpipe, of larger diameter, and of suificient length to complete therecovery operation, is attached to the bottom end of the stem of drillpipe and lowered into the hole. has attached to its lower end thefishing tool which has a diameter smaller than the inside diameter ofthe wash pipe, and may be any one of several types of tools used in suchrecovery operations. The cooperatlon with the My retrieving tool washpipe serves to cause to be pressed outwardly on oc- V casion a set ofslips or toothed jaws engaging the inside of the pipe and holding theretrieving tool against sliding in the pipe, and a second set of slipsengaging the nside of the pipe and holding the retrieving tool for rotaton in one direction.

The objects of my invention are: First, to provide a sliding slipassembly carrying wiper strips to engage the inside of the wash pipe,which assembly is movable as a whole up and down on the retrieving toolthrough the txiction of said wiper strips, and carries slips which aremade to hold the tool against sliding in the pipe by rela tive motionbetween the parts of the assembly; second, to provide a rotational driveslip assembly fastened on said tool above said sliding slip assemblyhaving slips or vertical teeth which may be pressed outward to engagethe inside of the pipe and hold the tool against rotation, such pressingoutward being controlled by wiping fingers which frictionally engage theinside of the wash pipe as same is rotated, but said wiping fingersbeing kept out of such engagement by means on said rotational drive slipassembly when the top of the sliding assembly is not in contact with thebottom of the rotational drive slip assembly; third, to provide forholding the sliding slip assembly at an upper position just under itscontact with the rotational drive slip assembly, and for releasing itfrom that hold by causing it to turn through a small arc; and fourth,provide for locking the parts of the sliding slip assembly againstsliding on each other so that the slips having horizontal teeth may notengage the wash pipe until after such locking is released.

With these and other objects in view my invention resides in theconstruction and arrangement of parts, herein fully described, andparticularly pointed out in the claims.

Referring now to the drawings, which are a part of this specification,and in which like characters indicate like parts:

Fig. 1 is an elevation of my retrieving tool with'the slid-' ing slipassembly in bottom position;

Fig. 2 is a plan view of the rotational drive slip assembly with the topdisk 22 removed, the slips 42 and,

the .wiping fingers 46 being placed outside of the disk 23;

' Figj31is a plan view of the top disk 22;

Fig. 4 is a side view of the press pin 30;

I Fig. 5 is a front elevation of the slip 42, wiping finger 46. andpress pin 30;

Fig. 6 is an elevation of the lower end of the tool with sliding slipassembly in contact with the rotational drive slip assembly; I

Fig. 7 is a plan View of the clutch 19;

Fig. 8 is a vertical section on the line 88 of Fig. 7; Fig. 9 is a planview of the upper sliding ring 62;

Fig. 10 is a plan view of the lower sliding ring 63;

Fig. 11 is a section of the gland 16 on the line 11-11 of Fig. 6;

Fig. 12 is a bottom view of the disk 23;

Fig. 13 is a detail of the slip ring 63 in normal position just abovethe gland 16;

Fig. 14 is a view similar to Fig. 13 with the slip ring 63 resting ontop of the gland 16;

Fig. 15 is a view similar to Fig. 13 with the slip ring 63 turned tolatch under the latch pin Fig. 16 is a plan view of the slip ring 63,the sleeve 18 being shown in section;

Fig. 17 is a vertical section showing the fastening of the gland 16 tothe sleeve 18; and, a i

Fig. 18 is a vertical section of the rotational drive slip assemblytaken through the key 21a.

The shank 10 of my retrieving tool is hollow, having a bore 11 runningthrough it full length through which may be passed liquids or the wiresleading to a backofi shot as is usual. At its bottom end the shank 10has a thread 13 to be screwed into a thread in the fishing tool 14 andjust above the thread 13 a stop collar 15 is welded or fastened to theshank 10.

Above the stop collar 15 is a cone shaped gland 16 increasing indiameter from bottom to top, and above the gland 16 is the sleeve 18having its threaded end screwed into a recess in the top of the gland 16and made fast by a set screw 81. The gland 16 has at its top a shoulder17. The sleeve 18 extends upward a considerable distance and has at itstop end a clutch 19 integral with it, the clutch 19 being a truncatedcone having its larger diameter at the top. The gland 16, sleeve 18 andclutch 19 move together as a single piece sliding on the shank 10, andon these members is mounted the mechanism operating the horizontal slips74, and the term sliding slip assembly is applied to these members andto the mechanism mounted thereon.

A short distance above the clutch 19 is mounted the rotational driveslip assembly which has a cam sleeve 20 provided with a keyway 21 toreceive a key 21a fitted into a keyway cut in the shank 10. The camsleeve 20 has three cylindrical cam surfaces 24, 24 spaced degreesapart, each increasing in distance from the center in clockwisedirection, and has at the top an upstanding annular flange 25 to fitinto the enlarged inside diameter of the upper disk 22. This upper diskand the lower disk 23 have greater diameters so that they extend outwardbeyond the cam surfaces 24, 24, and each disk hasthree countersunk holesthrough which are passed screws 27, 27 threaded into tapped holes 28, 28in the cam sleeve 20 by which the disk is fastened to the cam sleeve.

At the middle point of each of the three cam surfaces 24 there is cutinwardly a vertical groove 29, which is shown as dovetailed, but whichcould as well be rectangular, in which the wedging pin 30 may slide upand down. Each wedging pin 30 has at its upper end a is' substantiallysquarein cross section;

' 39 medi ine. i kzz nsh e;

shines?- T 77 Site press'aga'inst the upper disk 22.: The shelf 33 andall the lower parts of the wedge pin 30 are rectangular in jcrosssection and the'back of the pin toward the center 7 being in a. verticalplane surface. i The portion fit 'jpst below the shel f 331s: thin,having: agsmall radialf. rne'n sion, and is followed by a curvedorw'edging portion 35' increasingin thickness so thatithe next; portion36 79 willppi ess the; shoulders, sea-gag of'thevdisl; t downward beyondthe disk23. t

In the upper disk 22 .are cutthree arcuat'e g 40, and in th e lower.disk 23' are ciit'th're corresponding a'rcila te' guide slots 41$ Theseguide slots" are oiitside'vof and parallel toithe cam surfaces and beginjust be;

' yoncl in clockwise ro'tationthe, point from which the. cam

surface increases in, distanceffrom'i tuecemer-i Y Into the 'g uideslot40" fits the. upper slip guide 43" for. sliding V therein, and into theguide. s'l'ot 41"fitsflthe -liiwer-slip uts-e44. tThese'slip guidesaiepreterab1y ime ia1with thevslip 42, but 'of less thickness alongfltheradius; and extend into the slots 40 and 41,. to, guide the-slip 42along thetcylindrical camnsurface tz tf which its inside surface isshaped to fit. The outer surface of the slip t 42 is cut into angularVertical teeth whichfare adapted rounded-portion 31 which fits into andslides ina-roundhole 32 in-the, upper disk 22. Below the roundedpotttion 31 there is a shelf 33' which serves as astop for an expansionspring .79 placed on the rounded portion her side to engage the insideof the wash. pipe '12, in order. to

hold against rotation. A horizontal groove or. zone i is channeledacross the, teeth, of the slip' 42fatL theirf middle to receive'en d.of; the wipiiig finger 46. wiiic ena is fastened'to the slip 42 by arivet 47; V t I The wiping finger 46 is a thin s triplof resilientmaterial bentto conform to the cylindrical snrface. of the. inside ofthe wash pipe 12,, and is .of such overall'tlength thatitreaches-horizontally across the thickest portion of Cam surfae'e l to bein centact with the. wedge; pin 30wh en' the slip fizisf at startingposition with referenceto the guide slots', 40jand- .41. 'Aihorizontalgroove or; zone a t is channeled across. thethickest portion of cam sut-r face is-sonnet, that the: wiping fingert 46 may. seat therein andnot vberorced. against. the inside-of the wash' pipe'12; The wiingnngerte as a double bend pear its ,free end so} that thefreetend.presents a fiat feot 49 whichiisradiallitinward for. the restof thewipin-g finger 16v towardsfthe; Wedgepin ;30. Innormalpo'sitionjfor the wedge pin 30 the fiat foot 49 will rest onthethin portion 374 oft wedge pin when the slip, guide s,.- 43 a ti ai gn' i g n s op is -vt a wip. n -;fin 46 isn'ot pressed; outwardly into-contactrwith' thewaslr pipe .12; biit-lshouldvthe wedge pirr.30ebemoved upward thick: portion 36 thereof: will 2 press the: foot 49out-t wa'rdto bring the iper strip into such-contact.

Tl"ie u'nde'r sideiof'the lower disk 23 has-two cam sure V race-S151nearits edge- Teachtendingr-in atvertical'shoulder 52; to provide halfof a cliitch' jaw andv the-uppersside of the; clutch 1'9 'hasstwo camasurfaces 53 i to -r'natchi the cain,surfa'ces1. 51near its edge endingeach in :a-Lsliouldef '54; These four cam surfaces fit together?a'szazclutcl'i whereby the clutchlQ-cari be tuinedllin aicounterclockWise direction. when: it: is (in engagement with" disk 23? The,- restofthe toptsideof clutch '19 inward rein} the the shanks-c37 may-race. i

t .7 ram n e 23 the vs'edge'pins '30 atepressed iiipwardlj against thesprings-'79 so 'that'the full widthportion 36 ofeaeh-pinpresses the foot49 outward bringing the'wiping finger 46 into contact with theinside ofthe, wash pipe 12. 'By turning the 'wash pipe 12 to the right the slips42 are caused to slide on the cam surfaces 24 so that they engage firmlythe inside of the pipet12 and cause the retrieving tool to turn with thepipe 12 to the right, oriin V clockwise direction, and be held againstmovement upward or downward 'in the pipe.. Should the pipe 12 be turnedto the left, orin counter clockwise direction, the slips 42'will bebacked oif from engaging the pipe 12, and, unless the wedge pins 30 areagain raised by moving will remain out-'of contact'with'the" inside ofthe pipe 12.

Just below the upper surface of the clutch member 19 a two aligningarcu'a'te grooves 55"'refctaiigular in cross section arecutiit-the sdreasn; eacheoveringineaily a half circle and ending inanaabutment'78. atthe counterclockwise end of the groove. At thebe'ginning of each of thegrooves a slot is cut through to the top of the clutch member 19.' Theshank 10=has a notch 79 extending; inward to contain a detent 57'swinging on a' piiitSS; and pressed outwardly by a sp'iiriglSQL The fclet tent S Thas attapered surface on its underside' jso that matinee-191eanrp'ass ove'r' it and press itinw rdi and a fiat s urface norn 'sl'tqthe. shank 101m fit and hold-in one of uthetwoshalf grooves 55. andthereby prevent down-t wardlinovementofjthe clutch 19 on the shank- 10.Upon mrning; ;he. 1u h 19 n; counter clockwise directionthe detent 57willbe stopped by the abutment 78, andTu'p'on' turning; the, clutch 19to the right. the detent 57 will hebrought under the slot 60 andtheclutch 19 can he slid downward alonglthe'shank 10." The position. of,

detent 57,- on the shankl10 is suchfthat when it engages the clutchthalatterzwilltheheldslightly apart from tthe disk 231withthe wedgepins-30not raisedu j 7 7 The sleeve ISha'sLa key 6 1 extendingfrom itsouter surfaeefor' the full length of the sleeve" Slidable on the tsleeve 18 are an upper sliding ring 62 andalower; slid ingring 63,: eaehhaving awide' keywayj tto fit the t key 61 loosely and. thereby permit.'a' limited turning of the ring;s, .62 and. 63, about the sleeve 18.Thesesliding rings; 6 2 -and r63,- are connected by; three wiper strips65,-

'ofresilienhmetaljhaving at each end a short portion parallelto thesleeve 18' fastened; in a notch on thepcircumfe rencewo f one of theslip rings; 62-or (Sig-bya-grive't 66,,then a bent portionslantingoutwardly; andrinthe middle a long; wiper: portionv parallel tothe sleeve '18 V V and far: enough out from the center toimake'frictional f contact'withthe inside-of wash'pipe12; Thelowei' slidingring 63 has'a notch 67- cut upward from; its iunder side to the left orthe 'keyway 64th receive the:dowell;pin 68e'fastened on theshoul'deri17,=and a verti= cal slot 69ieutithroug'hit to the-rig'ht-nf'tHe'keywayiM through-which= will pass-'the.:latch pin 7ti'whicheiteiids upward from the? shoulder: 17. when' thei sliding fin isgioQve-sjs's'smiit e clutch"nienfber l9"isgfstopped froin in suehalignment off rotation about-its aids the end wiii -reseu enthetepof-theslidiiigringfilwhen a, ring has?- been turned* in co'uiiterclockwise" .directionjso ingofjthe sliding iin'g'63 movies theyertic'a'l slot'6 9with reference tothe latch'pin" a'nd;brings' itsmeander:

turningjiii counter clockwise} direction by the detent'corilingin'tocontact'with the' abutment 78, as will be hereina ftertexplainede t: v7' t V V Theslidin'g'riiighlhasnhiee horizontahslotssfll its middletoireceive th'e 'ends" 3,-bent at a right angle the sire" "i sl y ibwfii e;s -1 -1 e oinhsse slots 71 is tii l jo'ii an arc wider than thestrap end 73 so i thatthe strap end may slide in the slot when thesliding ring 63'is turned slightly on the sleeve 18. j

The slips 74 slide up and down on the'gland'16. Each slip has its innersurface cut so that it may slide on the conical surface of the gland 16and has a keyway to permit sliding on a dovetailed key 75 verticallydisposed and fastened on the gland 16. The outer cylindrical surface ofeach slip 74 is vertical, and is cut to providea series of horizontalteeth to grip the inside of the wash pipe 12 and hold the retrievingtool against'sliding down in the pipe. A vertical channel 76 is cutacross the upper teeth into which the strap 72 is inserted and fastenedbyarivet77.

In the operation of my device the retrieving tool is held vertical, asby being threaded into the fishing tool which is held at the platformabove ground by the slips on the platform, and the wash pipe 12 islowered over it. Raising the wash pipe causes the slip rings, 62 and 63,to be raised by friction of the wiper strips 65, and lift the" slips 74along the gland 16. so that they spread out and their teeth engage thewash pipe thereby holding the retrieving tool against sliding downwardin the wash pipe 12. Raising the wash pipe 12 still further lifts theclutch 19 into contact with the disk 23 causing the wedge pins to slideupward and bringing the wiping fingers 46 intofrictional contact withthe inside of wash pipe 12. Ashort turn of the wash pipe 12 in clockwisedirection will then bring the slips 42 into engagement with the insideof the wash pipe to hold the retrieving tool for clockwise turning withthe pipe, and also to hold it against sliding in-the pipe, especiallyagainst sliding upward. The clutch member 19, being held in angularposition about the shank 10 by the setting of the slips 74 against thewash pipe 12 will not necessarily be rotated at all about the-shank 10as the rotary grip and its lower disk'23 are turned slightly inclockwise direction, since the lower disk 23 and shank 10 can rotate soas to take a different angular position from that of the clutch 19;

The clutch 19 can now be permitted to slide down a shortdistance awayfrom the disk 23 to where the detent 57 will engage in one of thegrooves in the clutch member 19 and hold it against furtherdownward'sliding; 'Iheslips 74, being in engagement with the wash pipe12, will tend to hold the sliding rings, 62 and 63, in the same verticalposition with reference to the wash pipe 12, and the gland 16 slidingdown a short-distance along with the clutch 19 will tend to force theslips 74 more firmly outward.

The retrieving tool is now threadedinto the fishing tool 14 and lockedto the wash pipe 12, and is ready to go down into the drilled hole.Suflicient lengths of wash pipe to effect the recovery operation aremade up together, and the top joint attached to the drill pipe, which isof smaller diameter; then the whole string of fishing tool, retrievingtool, wash pipe and drill pipe is lowered into the hole until the bottomend of the fishing tool 14 reaches the top of the lost tool or lost workpiece. Then by some manipulation, turning the wash pipe from above, andapplying some of theweight of the string the fishing tool can bethreaded into the lost tool or lost work piece.

After connection has been made with the lost tool it will be desirableto start the washovcr operation to wash oif the dirt from around it. Forthis it will be desirable torelease the retrieving tool from grippingthe wash pipe so that the Wash pipe can be passed downward over thetool. To accomplish thisallow some of the weight of the string and thewash pipe 12 to bear down on the re-' trieving tool and give the washpipe a slight counter clockwise rotation of about half a turn. This willloosen the grip of the slips'42 on the wash pipe 12 and'bring the wipingfingers 46'back to where their feet 49 rest upon the thin; portions 34of the wedge pins 30. The clutch 19 willthen'b e held against slidingdown on the shank It! by the detent 57 engaging in one of the grooves55. By thep giving the wash pipe'l'2 a slight turn in'clockwise'direction the friction of e wiper strips 65 will cause the clutch 19 toturnin clockwise direction about the shank 10 bringing the slot 60 overthe detent 57." This permits the clutch 19 and the whole sliding slipassembly to slide downward on the shank 10, and, with the downwardmovement of the wash pipe 12 it slides down until the bottom of gland 16is in contact with the stop collar 15. The retrieving tool will thenofier no resistance to the downward movement of the wash pipe 12, andwhen the latter reaches the stuck point the dirt can be washed fromaround the lost tool.

It may be also desirable to set the retrieving tool so that the washpipe 12 can be pulled upward over it without causing the slips 74 tocome into contact with the wash .pipe. To accomplish this the drillstring and wash pipe are raised a distance suflicient for the frictionof the wiper strips to bring the clutch 19 upward to where the detent 57engages and holds in one of the grooves 55. Then the wash pipe 12 isgiven less than a half turn in counter clockwise direction to cause theclutch 19 to rotate in counter clockwise direction about the shank 10until the detent 57 is in contact with the abutment 78 so that theclutch 19, the sleeve 18 and the gland 16 are held against rotation in acounterclockwise direction. Next the wash pipe 12 is lowered so that thewiper strips 65 will bring the sliding ring 63 down on the sleeve 18into position for latching, which position is just above the dowel pin68 with the latch pin 70 extending through the slot 69; Finally the Washpipe 12 is given a short turn in counter clockwise direction so that thewiper strips 65 will cause the sliding ring 63 to move slightly in thatdirection as far as is permitted by the extra width of the keyway 64,and become latched under the latch pin.7.0. With this latchingaccomplished the slips 74 cannot slide upward on the gland-16 to comeinto engagement with the inside of the wash pipe 12 and the latter canbe raised to a point where it is desired that the retrieving tool engageit at a new position.

To reengage the retrieving tool with the wash pipe 12 the latter isrotated slightly in clockwise direction suflicient to cause the Wiperstrips 65 to move the sliding ring 63 in clockwise direction and unlatchit from the pin 70. The slips 74 can then slide on the gland 16 and bebrought into engagement with the wash pipe 12 by lifting same as aboveshown. It will then be desirable to effect the grip of the slips 42 byrotating the wash pipe 12 as above shown to hold the retrieving toolfrom sliding upward in the wash pipe as well as against relativerotation. Whether the grip of the slips 74 was effective can be told bythe additional indicated weight of the string. After both slips 74 and42 have engaged the whole string with the lost tool at, the end can belifted out.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is:

l. A grip against rotation fitting inside of a pipe, comprising alongitudinal shank, a sleeve fastened on said shank having a pluralityof cam surfaces each increasing in distance from the axis. in onedirection of rotation, a slip for each cam surface adapted to slidethereon having extensions upward and downward beyond said cam surfacesand having longitudinal teeth to engage the inside of the pipe, meansfastened to said shank disposed above and below said cam surfaces forguiding said extensions as each of said slips slides on its cam surface,a wiping finger extending transverse to the axis attached to each slipat one end having the free end adapted to be pressed outwardly to bringthe wiping finger into frictional contact with the inside of the pipe,said sleeve having a groove cut longitudinally in each cam surface, awedge pin having a thin portion and a thick portion mounted toslideineach groove from the point where a thin portion of the pin underlies thefree end of the wiping finger to the point where a thick portion thereofunderlies and presses outward the free end of the wiping 7 amps? wed ePin and m weqh n n its ew tqwh its k; p ni n e ie the nd fr hewipifinger; v

i-s naa a s m en; n le; p p wm:

eas ng-alongit1dinal shank, a sleeve tastened'on said shankfand a diskfastened to each end of the sleeve, said sleeve-having,Qamluralitwof;cam suIfaces each inCIeaSing in edist-aneerfromitheaxis in one directionI of rotation, at

t slip {preach earn si rfaee adapted =to slide thereonhaving Vlengitudinabteeth?togengagethe inside-of;the'gpipe a guide portion"ateach end-ofaslim-a guide 'slotin each of-the disks; said guide slotsreceivin'g an'd holding said guide portions so; that eachslip may. slideon the cam surface,

awipinggfinger extending transverse to the axis attached to-eacli slip;at= one: end =havi-ng=-1the free nd adapted to be pressed" outwardly?f0: bringethe Wiping finger into:-

frictional contactwithlthe'insideofithe pipe; a groovecut lohgitudinally-irieach cam surfaceeach of the disks havingianopening;aligningwithsaid groove, a-we'dge pin fiibunted to :sli'de insaid groove'with'its ends-extending the inside 'of ithe 'pipe 'andhaving-at: one: end a normalsurface t'd contact said wedg'epins andmove.each pin in itsgrbove to Where its thick portion u'nderlie's' theend of the wipin'gfingef; t t

' 3: grip against :rotation"as-described'in claim l wh'eie'in eachwedgeipin ha :an abu'tment to'- engage the disk whichis on one side oftlieisleeve; and a spring pressing against the other disk and against a"second abutment on the'wed'g'e' pin holding its thinportion under thefree end; of th'e vviping fihger, but permitting -the Wedge pin tobe'moved -a'g'ainstsaid spring to bring its thick portion under-saidfree end. v

- 4'; A' meniher-"slidable upon-a verticalshankyboth posh' tidned withina-vertical pipe; stops on said shank above andbelowsaid rr'ien'lber' tolimit itssliding; said member havingat its-lower enda glandincreasiri'gtin its conical diameter from h'ottorn to top, a sleeveabove said gland having a key for its "entire length, and a member oflarge? diain'etef than the'topbf said-gland slidable'on'said' shaftabove said sleeve; two slidihg rings; each 'havin'g' I akeyway for saidkey joined by vviper strips which extendoutwar d tocontact theinside ofsaid fiip'e; said twdslid ing ringssliding on said sleeve,a plurality ofslipsb elow said sleeve "s'upport'e'd by straps from' the lower'o'f':said

sliding rings, each slip having a'n inside surface contactifigfsaid'-glandto-permit the sliptd slidethereon and a cylindricalouter surfaceprovided with horizontal teeth vvhicli engage the inside of said pipewhen the slip is lifted ithe Irnemher 'abo've" said" sleeve having anannular I s. -A'-member s lidableup'on a ver ical shank; both wesitioned Withitl; a vertical pi-pe stops n said shank above and belowsaid member to limititssliding; said member havingat its; lowerend-agglandin ci eas ng; inIi ts colical I diameter from bottom to top, asleeve abhve said gland face contacting p "slide tlifreo'nj nd a cylndricalon surfa v'ififhfliorfz ontalffeefli-vvliieh en the?in'fsidei'bfsaidpi ttvi hentliesl'ifi is lift ed theIsa I slidiiig'firig 'hziviiigfor eaeh strapa Wide "hcir'iz biit I I t p ernlittin'slight rotationof the ringawitht refereiicitbf 15' riiiIz irgYtio eciitoutwardly f nfilar gfodvebein I I I I each": poriion having an escaphatchout new to 1 I the toiifof th'e frflemhei at 'its'hjeginning' a d:an slimme t I I closingmli gfo'dve' its end; saidsha having a rece'ss 20cufifivvardlyQ f roni-its surtacegadetent tiivoted-in s drecess a'da jtd"t6" prniit the slida -ble' r fieml ier; to I slide upg wardydvet fithut itoengage in's aid annular groove l a' ble n r eni ber' n r the top'of its traveI on theshan but perini ttlie said=mernbertd slide down wardt. A 21 i t flbi e l i g nsh a est al $1 1; a latch prn rnountedonthefshoulder at the top} ofs a'i d gland adapteclto pass' thr ough,saidslot'when the lower .7 i a 1? t l d i s-t nse fsa th P sme i 9 a d-seeve- 18 9 2 h li sl hsv r s d defnt w tact with-said abutnfent in-saidia'hnular; groove.

lidable member asset forth side of said sleeve and against'a second-aibutmentton t he 'wedgemin "holding-tits thin portion under the freeend --of the Wiping-finger; but permitting the wedge pin ,to bemoved-againstsaid springztoihring its thick-p'ortionunder said free end,the member-slidable-onsaidshank-beinghelovvsaid'gi ig against rotation;a -stop onsaid shanl; lief 71m s a idmengber to limit its sliding saidslidalble" rfiemberlhaving at i ts aws; my a gland ineieasing itsconical diaineter above said -g lnd havinglliy tori-ts entire length,and a iiiember of larger 'di'ainet'r above saidfsleev hang. s an its-toi ha-namin 'faceror contactin 'saidwex ige i 'girir'i'gsfac haviiigakey-way 'fdr "said key iiiei sfriPsQ-siid t wb slidin'g'fiingsfslidiiig"of {slips below said sleeve 'e' ldwe'r of aid sliding 'rifig's; I I Vn-insr e s ur-faee contacting said gland to' fieriiiit the slip to"slidet hefeoh "an'd a cylindricaljou'tef sunset rbv'ided'witti ribr dmateemwhich engage-dia j nieifiber it s' escape hatchin alignment vv ithf' V g: restson said shoulder-land further adagted from' {the bottom Ito top; -a sleeve 7 ii its surf ce, a detent pivoted in said recessadapted to perthe slidahle member to slide upward over it, but to engagein said annular groove to hold said 'slidable member near the top of itstravel on the shank but permit the said member to slide downward whensaid member has its escape hatch in alignment with said detent, saidlower sliding ring having a vertical slot, a latch pin mounted on theshoulder at the top of said gland adapted to pass through said slot Whenthe lower sliding ring rests on said shoulder and further adapted tohold said lower 10 2,647,008

sliding ring when the ring is turned on said sleeve against the holdingof said detent in contact with said abutment in said annular groove.

References Cited in the file of this patent UNETED STATES PATENTS PhippsJuly 6, 1937 Hammer Oct. 24, 1944 Stewart et al. July 28, 1953

